import django
from django.shortcuts  import  render # type: ignore
from django.shortcuts import render,get_object_or_404
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
from django.core.mail import send_mail
from .models import Post
from .forms import EmailPostForm,CommentForm
from django.db.models import Count
from django.contrib.postgres.search import SearchVector
from .forms import EmailPostForm, CommentForm, SearchForm
# Create your views here.
def post_list(request): 
   posts = Post.published.all()
   paginator = Paginator(posts, 3)
   page = request.GET.get('page')
   try:
       posts = paginator.page(page)
   except PageNotAnInteger: 
       posts = paginator.page(1)
   except EmptyPage:
       posts = paginator.page(paginator.num_pages)
   return render(request, 'blog/post/list.html', {'posts': posts,'page': page})
def post_detail(request, year, month, day, post):
    post = get_object_or_404(Post, slug=post, status='published',
                             publish__year=year,
                             publish__month=month,
                             publish__day=day)
    post_tags_ids = post.tags.values_list('id', flat=True)
    similar_posts = Post.published.filter(tags__in=post_tags_ids)\
                             .exclude(id=post.id)
    similar_posts = similar_posts.annotate(same_tags=Count('tags'))\
                                .order_by('-same_tags','-publish')[:4]
    new_comment = None
    comments = post.comments.filter(active=True)
    if request.method == 'POST':
        comment_form = CommentForm(data=request.POST)
        if comment_form.is_valid():
            new_comment = comment_form.save(commit=False)
            new_comment.post = post
            new_comment.save()
    else:
        comment_form = CommentForm()
    post_tags_ids = post.tags.values_list('id', flat=True)
    similar_posts = Post.published.filter(tags__in=post_tags_ids)\
                                    .exclude(id=post.id)
    similar_posts = similar_posts.annotate(same_tags=Count('tags'))\
        .order_by('-same_tags','-publish')[:4]
    return render(request, 'blog/post/detail.html',{'post': post,'comments': comments,'new_comment': new_comment,'comment_form': comment_form,'similar_posts': similar_posts}) # type: ignore
def post_share(request, post_id):
    post = get_object_or_404(Post, id=post_id, status='published')
    sent = False
    if request.method == 'POST':
        form = EmailPostForm(request.POST)
        if form.is_valid():
            cd = form.cleaned_data
            post_url = request.build_absolute_uri(post.get_absolute_url())
            subject = f"{cd['name']} recommends you read " \
                       f"{post.title}"
        message = f"Read {post.title} at {post_url}\n\n" \
                 f"{cd['name']}\'s comments: {cd['comments']}"
        send_mail(subject, message, '1554613108@qq.com'
                  [cd['to']])
        sent = True
    else:
        form = EmailPostForm()
    return render(request, 'blog/post/share.html', {'post': post,'form': form,'sent': sent})
def post_search(request):
  form = SearchForm()
  query = None
  results = []
# 如果请求中有query字段则获取表单中的数据进行处理
  if 'query' in request.GET:
# 获取表单
    form = SearchForm(request.GET)
# 如果表单中的数据验证通过，即有效，则获取并处理
  if form.is_valid():
# 获取搜索内容保存下来
    query = form.cleaned_data['query']
# 根据标题和正文字段构建搜索向量并生成搜索字段，再根据搜索内容筛选出匹配内容保存
    results = Post.published.annotate(
    search=SearchVector('title', 'body')
    ).filter(search=query)
# 将搜索结果渲染到搜索模板并返回
  return render(request,
                'blog/post/search.html', {
                'form': form,
                'query': query,
                'results': results
              })